Radiographic digital image enhancement. Part II: transform domain techniques

Digital image enhancement techniques can have a significant impact on the d iagnostic quality of a radiographic image. Selection of an image enhancemen t technique is a function of image content and its attributes of interest. The diagnostic value of a radiographic image is commonly reduced by its int rinsic limitations as well as interference from unwanted signals. In this s econd article on radiographic image enhancement the fourier transform, the most commonly used transformation method, is used to examine tramples of me thods for image enhancement, with particular emphasis on the removal or red uction of noise.